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(No Model.)

A. W; BROWNE.

DENTAL CHAIR. No. 519,884. Patented May 15,1894.

WITNESSES INVENT OR W W 9" M UNlTE TATEs PATENT BEIGE.

ARTHUR W. BROVVNE, OF PRINOES BAY, NEW YORK, ASSIGNOR TO THE S. S. WHITE DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA,

PENNSYLVANIA DENTAL CHAIR.

SPECIFICATION formingpart of Letters Patent No. 519,884, dated May 15, 1 894.

Application filed February 5, 1894. Serial No- 99,050- (N0 model.)

1'0 and whom it may concern:

15c it known that I, ARTHUR W. BROWNE, a cltizenoftheUnitedStates,residingatPrinces Bay, in the county of Richmond and State of New York, have invented a certain new and useful Improvement in Dental Chairs; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to a certain improvement, as hereinafter claimed, in means for imparting a wide range of vertical adjustment to the bodies of dental chairs.

In my application for United States Letters Patent, Serial No. 494,848, filed December 27, 1893, are shown improvements of the class to which my present invention relates, andl make no claim herein to features claimed or claimable in my said prior application.

In the accompanying drawings which show a suitable embodiment of my improvement, Figure 1 is a view mainly in side elevation, some parts being in vertical section. Fig. 2 1s a horizontal section on the line 2 of Fig. 1, on an enlarged scale, showing details of construction.

My improvement is represented as applied to a dental chair such as shown in United States Letters Patent No. 197,414], dated ,November 20, 1877, and No. 483,807, dated October 4, 1892. As in said patents there is provided a support (hereinafter termed the main elevating and lowering support) for the chair body A, said support consisting of the plunger A5 having vertically adjustable connection with the base or pedestal A and actuated by means of the jointed elevating leyer A and cooperating devices, the lever being jointed to the cylinder B which is adapted to turn horizontally in the pedestal and to be locked therein by the locking lever B. The vertically adjustable support has no horizontal or turning movement in the cylinderB to which the lifting lever is attached, and the manner of upholding and of lowering the lowering support A, so as to increase the range of vertical adjustment ot the chair body, and this supplementary elevating and lowering mechanism is constructed and supported as follows: The main elevating and lowering support is provided at its upper end with a suitably attached bracket 0 rigid therewith having at its outer end in front of the main support a bearing sleeve or supporter D projecting downwardly and parallel with the main elevating and lowering support and serving to carry and guide a vertically adjustable bar or rod E having the gear rack or row of teeth e. Apinion F gearing with this gear rack is secured to a shaftf turning in bearings in the bracket 0; the pinion is located between the rack rod and the main support. A sheave or pulley G secured to the pinion shaft has one end of a chain 9 fastened to its periphery, the other end of the chain being secured-to the cylinder B. At its upper end the adjustable rack rod E is provided with the chair body carrier H of the supplemen tary raising and lowering mechanism, this carrier being fastened in suitable Way to the rod. The chair body is jointed to its carrier at it over the main raising and lowering support, so as to be capable of tilting vertically. A detent segment I on the chair body is adapted to be engaged by a suitable lever on the chair body carrier so as to secure the chair body in the position to which it may be tilted. These detent devices may be of any well known suitable construction, and detailed description thereof is not here necessary.

From the above description it will be seen that as the main elevating and lowering support is vertically adjusted the pinion of the supplementary elevating and lowering mechanism turns to raise or lower the rack rod, j

the cylindersupported thereby, the main elevatingand lowering support, means for vertically adjusting the support in the cylinder, the bracket rigid with said main support-and provided at its outer end with the supporter extending downwardly and parallel with the main support, the vertioallyadjustable rack rod sustained by said supporter, the pinion gearing with the rack rod and having its shaft mounted in bearings in the bracket ofthe main support between said support and the rack rod, the pulley on the pinion shaft, the chain secured at its opposite ends to the pulley and cylinder, the chair body carrier at the upper end of the rack rod, the chair body :5 having jointed connection with said carrier, and means serving to tilt the chair body about said jointed connection and secure it 1n its tilted position, substantially as set forth.

In testimony whereof Iaffix my signature in 20 presence of two witnesses.

ARTHUR WV. BROWVNE.

Witnesses:

ELI T. STARR, E. EUGENE STARR. 

